Fig. 1. SEM image of microsphere cavity prepared by arc discharge method

Fig. 2. Schematics of microsphere cavity packaging steps. (a) Microsphere cavity is nested in glass tube; (b) tapered fiber is fixed on glass plate; (c) relative position between tapered fiber and microsphere cavity is controlled by high precision 3D adjustment platform; (d) three-dimensional structure is placed in glass box

Fig. 3. Observation system for resonance characteristic of packaged microresonator device. (a) Excitation device for resonance modes of microsphere cavity; (b) experimental device of packaged microsphere cavity; (c) optical micrograph of tapered fiber coupled microsphere cavity

Fig. 4. Resonance spectra of packaged microsphere cavity. (a)Total view of resonance spectrum; (b)magnified view of resonance spectrum; (c)typical resonance spectrum and Lorenz fitting curve

Fig. 5. Electric field distribution under each mode of microsphere resonator

Fig. 6. Stability evaluation of resonance mode transmittance. (a)Transmittance versus time; (b) Allan variance of transmittance

Fig. 7. Stability evaluation of resonance wavelength point. (a)Resonant wavelength shift versus time; (b)Allan variance of resonant wavelength shift; (c) Δf versus time; (d) Allan variance of Δf